What could be behind Buffett's $6 billion bet on Japanese trading firms

Warren Buffett, chairman and CEO of Berkshire Hathaway Inc
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Warren Buffett just added a $6 billion bet on the five largest Japanese trading firms in his first major foray into the developed Asian market. 

Berkshire Hathaway said Sunday it has acquired stakes of more than 5% in each of the five leading Japanese trading companies — Itochu Corp., Marubeni Corp.Mitsubishi Corp.Mitsui & Co., and Sumitomo Corp.

Here are the biggest takeaways of the big money move: